Fix flaky tests: wait for worker console logs before asserting

Console logs from the CAD worker can arrive slightly after isWorking()
returns false. Add waitForFunction polls for expected log tags before
reading getConsoleLog() in the Measurement, Selector API, and Console
tests.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: zalo

test/cascade-studio.spec.js

@@ -306,6 +306,10 @@ test.describe('Console', () => {
       console.log("a", "b", 42);
       Box(10, 10, 10);
     `);
+    await page.waitForFunction(() => {
+      const logs = window.CascadeAPI.getConsoleLog();
+      return logs.some(l => l.includes('test message'));
+    }, { timeout: 10000 });
     const logs = await page.evaluate(() => window.CascadeAPI.getConsoleLog());
     expect(logs.some(l => l.includes('test message'))).toBe(true);
     expect(logs.some(l => l.includes('a') && l.includes('b') && l.includes('42'))).toBe(true);
@@ -350,6 +354,12 @@ test.describe('Selector API', () => {
     `);
     const errors = await page.evaluate(() => window.CascadeAPI.getErrors());
     expect(errors).toEqual([]);
+
+    // Wait for all expected log tags to arrive (worker messages may lag slightly)
+    await page.waitForFunction(() => {
+      const logs = window.CascadeAPI.getConsoleLog();
+      return ['EDGE_COUNT:', 'TOP_FACES:'].every(tag => logs.some(l => l.includes(tag)));
+    }, { timeout: 10000 });
     const logs = await page.evaluate(() => window.CascadeAPI.getConsoleLog());
 
     const edgeCount = parseInt(extractLog(logs, 'EDGE_COUNT'));
@@ -386,6 +396,12 @@ test.describe('Measurement Functions', () => {
     `);
     const errors = await page.evaluate(() => window.CascadeAPI.getErrors());
     expect(errors).toEqual([]);
+
+    // Wait for all expected log tags to arrive (worker messages may lag slightly)
+    await page.waitForFunction(() => {
+      const logs = window.CascadeAPI.getConsoleLog();
+      return ['VOL:', 'AREA:', 'COM:'].every(tag => logs.some(l => l.includes(tag)));
+    }, { timeout: 10000 });
     const logs = await page.evaluate(() => window.CascadeAPI.getConsoleLog());
 
     expect(parseFloat(extractLog(logs, 'VOL'))).toBeCloseTo(1000, 0);